Water-soluble anthraquinone dyestuffs and a process for their manufacture



Patented Jan. 7, 1941 UNITED STATES a PATENT 0F FICE WATER-SOLUBLE ANTHRAQUINONE DYE- STUFFS AND A PnooEss non THEIR MAN- UFACTURE Ernst Gutzwiller, Basel, Switzerland, assignor to Sandoz, Ltd., Basel, Switzerland No Drawing. Application June 28, 1938, Serial No. 216,347. In Switzerland July 13, 1937 15 Claims.

wherein one of the Xs represents hydrogen, amino, alkylamino, hydroxyalkylamino and arylamino groups, the other X being hydrogen, and in the case that X represents an arylamino group, this may contain substituents such as alkyl, halogen, amino, arylamino and acylamino groups, and wherein Z represents hydrogen or halogen.

The sulphonaticn of the above cited anthraquinone compounds is carred out with the usual sulphonating agents, preferably with fuming sulphuric acid containing 5 or more per cent of sulphur trioxide or with chlorosulphonlc acid and at temperatures of 20-150 0. Sometimes it is advantageous to carry out the sulphonation in presence of boric acid or of metal salts such as mercury sulphate, sodium sulphate or potassium sulphate.

The end point of the sulphonation is ascertained by taking out a sample and controlling its solubility in water. The dyestuffs are isolated in the usual manner by pouring the sulphonation mass on ice or water and by subsequent filtration and neutralization.

The dyestuffs thus obtained possess the following general formula wherein n represents a whole number,Z represents halogen or hydrogen and one of the X's represents hydrogen, amino, alkylamino, hydroxyalkylamino and arylamino groups, the other X being hydrogen, and in the case that X represents an arylamino group, this may contain substituents such as alkyl, halogen, amino, arylamino and acylamino groups. They dye, as it has been said above, animal fibres yellow, orange, brown or grey shades of excellent fastness properties.

One object of the present invention is the process for the manufacture of water-soluble anthraquinone dyestuffs, comprising sulphonating anthraquinone compounds of thegeneral formula wherein one of the Xs represents hydrogen, amino, alkylamino, hydroxyalkylamino and arylamino groups, the other X being hydrogen, and in the case that X represents an arylamino group, this may contain substituents such as alkyl, halogen, amino, arylamino and acylamino groups, and wherein Z represents halogen or hydrogen,

preferably at temperatures of 20 to 150 C. and in presence of boric acid or of metal salts.

Other objects of the present invention are the new water-soluble dyestuffs of the general formula wherein n represents a whole number, Z is hydrogen or halogen and one of the Xs represents hydrogen, amino, alkylamino, hydroxyalkylamino and arylamino groups, the other X being hydrogen, and in the case that X represents. an arylamino group, this may contain substituents such as alkyl, halogen, amino, arylamino and acylamino groups.

Further objects will appear hereinafter.

The following examples, without being limitative, illustrate the present invention, the parts being by weight:

Example 1 5 parts of 1,4-anilido-Bz-l-benzanthronylaminoanthraquinone, obtained by condensation of 1,4-aminoanilidoanthraquinone with Bz-l-halogenbenzanthrone, are treated with 40 parts of fuming sulphuric acid of 10-50% S03 at 4080 C., until a. test shows that the starting product became completely water-soluble. The dyestufi is isolated by pouring the sulphonation mass into ice or water. It dyes wool beautiful reddish-grey shades of excellent fastness. If the sulphonation is carried out at higher temperature, a dyestuff witha-more bluish shade will be obtained.

Example 2 5 partsv of 1,4-p-toluido-Bz-'l-benzanthronylaminoanthraquinone, obtained by condensation of 1,4-aminotoluidoanthraquinone with B'ze-lhalogen-benzanthrone orby condensation of 1,4- halogen-p-toluidoanthraquinone with Bz-laminobenzanthrone are treatedwith 30 parts of fuming sulphuric acid of 10% S03 and at.'70'-80 C., until a test shows thatit became water-soluble. The isolated dyestuff dyes wool grey shades of excellent fastness.

Instead of fuming sulphuric acid one can also use a suitable quantity of chlorosulphonic acid.

Example 3 benzanthronylaminoanthraquinone, 1,4-mesidino- Bz,1 benzanthronylaminoanthraquinone, 1,4-: or p-naphthylamino-Bz,l-benzanthronylaminoanthraquinone etc. also yield valuable dyestuffs when subjected to the above described method of sulphonation.

Example 4 5 parts of 1,5-p-toluido-Bz,1-benzanthronylaminoanthraquinone, obtained for example by condensation of 1,5-amino-p-toluidoanthraquinone with Bz,1-chlorobenzanthrone, are treated with25 parts of fuming sulphuric acid of $03 at 40-45" C., until a sample is soluble in water.

The dyestufi thus obtained dyes wool brownred shades of excellent fastness properties.

Instead of the p-toluido-radical other derivatives containing aromatic or aliphatic amino radicals can be used, whereby on sulphonation valuable dyestuffs may be obtained.

Example 5 4 parts of 1,4-anilido-Bz,1-(6-bromobenzanthronylamino)anthraquinone obtained by condensation of 6-Bz,1-dibromobenzanthrone with 1,4-aminoanilidoanthraquinone are treated with parts-of fuming sulphuric acid at 70-100 C., until the starting product has become watersoluble.

The isolated dyestuff dyes wool grey shades.

Example 6 5 parts, of 1A-anilido-Bz,1-benzanthr,onylaminoanthraquinone: are dissolved in 40 parts of fuming sulphuric acid of 12% S03, and after addition of 0.1 part of mercury oxide, stirred at 50 C., until a sample is completely water-soluble.

The obtained dyestufi dyes wool reddish-grey shades.

Example 7 5 parts of 1,Bz,1-benzanthronylaminoanthraquinone are dissolved in 35 parts of fuming sulphuric acid of 12% S03 and stirred at 2040 C., until a sample is water-soluble.

The isolated dyestufl dyes wool yellow shades of good fastness properties.

Example 8 5 parts of1,4-amino-Bz,l-benzanthronylaminoanthraquinone are dissolved in parts of fuming sulphuric acid of 10 to 15% SO: in presence of 0.1 part of mercury oxide and heated at 60'-80 C.,,until the mass has become watersoluble.

The dyestufi thus obtained dyes .wool'reddishgrey shades.

Example!) 5 parts of" 1,5-amino-Bz,l-benzanthronylaminoanthraquinone. obtained by condensation of 1 molecule of Bz,1-halogen-benzanthrone with 1 molecule of 1,5 diaminoanthraquinone, are treated with -parts of fuming: sulphuric acid of 12% S03 at 20-40 C., until the product has become water-soluble.

The isolated dyestuff dyes wool brownish-red shades.-

Example-10 5 parts of 1,4-ethanolamino-Bz,l-benzanthronylaminoanthraquinone are dissolved in presence of 1 part of boric'acid-in 40 parts of fuming sulphuric acid of 10% SO'3 and stirred at 4060 C., until the starting material has become watersoluble.

The isolated dyestulT dyes wool greyshades.

Example 11 20 parts of 1,4-ani1ido-Bz,1-benzanthrony1aminoanthraquinone, parts of anhydrous sodium sulphate and 150 parts of fuming sulphuric acid of 15% S03 are stirred together at 70 C., until a sample is completely soluble in water.

The isolated dyestufi dyes wool and leather dark grey shades.

Example 12 parts of 1,4-anilido-Bz,1-benzanthronylaminoanthraquinone are dissolved in 200 parts of fuming sulphuric acid of 15% S03 and stirred at 50-55 (3., until a sample is soluble in water.

The isolated dyestuff dyes Wool grey shades.

Example 13 20 parts of 1,l-anilido-Bz,l-benzanthronylaminoanthraquinone are dissolved in a mixture of 50 parts of sulphuric acid monohydrate and parts of fuming sulphuric acid of 68% S03 and stirred several hours at 30 C., until a sample has become fully Water-soluble.

The isolated dyestuff dyes wool reddish-grey shades.

Example 1.4

20 parts of 1,4zanilido-Bz,l-benzanthronylaminoanthraquinone are dissolved in 140 parts of fuming sulphuric acid of 20% S03 and stirred at room temperature, until a sample is soluble in Water.

The isolated dyestuff dyes wool grey shades.

What I claim is:

l. The Water-soluble dyestuffs of the general formula wherein n is a Whole number, Z is a member of the group consisting of hydrogen and halogen and one of the X's stands for an arylaminogroup, the other X being hydrogen, said dyestuffs dyeing animal fibres brown and grey shades.

3. The water-soluble dyestufis of the general formula wherein n is a Whole number, said dyestuffs being soluble in concentrated sulphuric acid With a blue coloration and dyeing animal fibres grey shades.

4. The water-so1uble dyestuffs of the formula z L- V -Q -Q wherein n is a Whole number, which dyestuffs are soluble in concentrated sulphuric acid with a blue coloration and dye animal fibres grey shades.

5. The Water-soluble dyestuffs of the formula wherein n is a Whole number, which dyestuffs are soluble in concentrated sulphuric acid with a blue coloration and dye animal fibres grey shades.

6. The water-soluble dyestuffs of the formula wherein n is a Whole number, which dyestuffs are soluble in concentrated sulphuric acid with a blue coloration and dye animal fibres grey shades.

7. A process for producing water-soluble dye- (SOalEDn stufis by treating anthraquinone compounds of 13. A process for producing water soluble dyethe general formula stufis by treating an anthraquinone compound of the formula II 5 o wherein Z is a member of the group consisting of hydrogen and halogen d one of the Stands with fuming sulphuric acid in presence of anhyfor a member of the group consisting of hydrodrous sodium sulphate at a temperature below gen, amino, alkylamino, hydroxyalkylamino and 00 a y e other X being hydrogen, With $111- 14. A process for producing water-soluble dyephonating agents at a e pe of 20450) stuffs by treating an anthraquinone compound of 8. A process for producing water soluble dyethe formula,

stuffs by treating the same anthraquinone compounds as in claim 7 with fuming sulphuric acid H at a temperature of 20-150 C.

9. A process for producing water soluble dyestuffs by treating the same anthraquinone compounds as in claim 7 with fuming sulphuric acid at a temperature of 20-150 C. in presence of boric acid as a catalyst.

10. A process for producing water soluble dye- NH NH stuffs by treating the same anthraquinone com- 1 pounds as in claim 7 with fuming sulphuric acid at a temperature of 20-150" C. and in presence of a metal salt of sulphuric acid. O

11. A process for producing water soluble dyestuffs by treating the same anthraquinone com- Wlth fumil'lg sulphllllc acld 1n p e of ypounds as in claim 7 with fuming sulphuric acid drous sodlum su p at a t p ratu e below at a temperature below 100 C. and in presence f anhydrous Sodium w t 15. A process for producing water-soluble dye- 12. A process for producing water soluble dye- Stuffs by treating an anthraquinone compound of stuffs by treating anthraquinone compounds of the formula the general formula 0 with fuming sulphuric acid in presence of anhywith fuming sulphuric acid in presence of anhydrous sodium sulphate at a temperature below drous sodium sulphate, at. a temperature below 100 C. C. ERNST GUTZWILLER. 

